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8. NOISE LEVEL MEASUREMENT
Be careful with loud ambience noise. Your hearing may take damage. Always use hearing protec-
tion in loud environments! Ensure that there are no objects or persons between the microphone
and the sound source.
A sound source must always be measured directly. Point the sound level meter directly at the sound source.
To avoid influencing the sound waves yourself, hold the meter at arm’s length from your body or attach the
meter to the enclosed stand. Move away from the measuring point if possible. A stand attachment (17) is
present at the rear of the housing.
Avoid vibrations or movements.
If there is wind (>10m/s), use the enclosed wind protection to avoid falsifying the measured value by wind
sounds. The wind protection does not falsify the measured value.
To achieve the highest possible measuring accuracy, a sound level calibration with an external sound calibra-
tor (not enclosed) should be performed before every sound level measurement.
Proceed as follows for the sound level calibration:
- Switch on the sound level meter.
- If required, deactivate the functions “MAX/MIN” and “HOLD”.
- Plug the microphone of the sound level meter without wind protection into the opening
of the sound calibrator. Ensure tight fit so that the calibration chamber in the sound
calibrator is sealed.
- Set the following parameters at the sound calibrator: 94 dB at 1 kHz
- The meter should now display a sound level of 94 dBA. If this is not the case, the meter
must be reconciled.
- Open the lateral cover (16) at the meter.
- Carefully turn the lateral calibration point (CAL calibration potentiometer 12) with the
enclosed reconciliation screwdriver until the display shows precisely 94.0 dBA.
- The meter is ready for use. Close the cover and remove the calibrator.
